linux-kernel - Re: [PATCH] mm: skip if required_kernelcore is larger than totalpages

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Date:	Fri, 09 Oct 2015 08:41:02 -0700 (PDT)
From:	Yasuaki Ishimatsu <yasu.isimatu@...il.com>
To:	Xishi Qiu <qiuxishi@...wei.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>,
	"David Rientjes" <rientjes@...gle.com>,
	Tang Chen <tangchen@...fujitsu.com>, <zhongjiang@...wei.com>,
	Linux MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: skip if required_kernelcore is larger than
 totalpages


On Thu, 8 Oct 2015 10:21:05 +0800
Xishi Qiu <qiuxishi@...wei.com> wrote:

> If kernelcore was not specified, or the kernelcore size is zero
> (required_movablecore >= totalpages), or the kernelcore size is larger

Why does required_movablecore become larger than totalpages, when the
kernelcore size is zero? I read the code but I could not find that you
mention.

Thanks,
Yasuaki Ishimatsu

> than totalpages, there is no ZONE_MOVABLE. We should fill the zone
> with both kernel memory and movable memory.
> 
> Signed-off-by: Xishi Qiu <qiuxishi@...wei.com>
> ---
>  mm/page_alloc.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index af3c9bd..6a6da0d 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -5674,8 +5674,11 @@ static void __init find_zone_movable_pfns_for_nodes(void)
>  		required_kernelcore = max(required_kernelcore, corepages);
>  	}
>  
> -	/* If kernelcore was not specified, there is no ZONE_MOVABLE */
> -	if (!required_kernelcore)
> +	/*
> +	 * If kernelcore was not specified or kernelcore size is larger
> +	 * than totalpages, there is no ZONE_MOVABLE.
> +	 */
> +	if (!required_kernelcore || required_kernelcore >= totalpages)
>  		goto out;
>  
>  	/* usable_startpfn is the lowest possible pfn ZONE_MOVABLE can be at */
> -- 
> 2.0.0
> 
> 
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